Glam pregnancy! Gwen Stefanidressed up her baby bump for its red carpet debut on Thursday, Oct. 17. The 44-year-old singer showed off her pregnancy glow in a gorgeous gray shimmery dress at the Wallis Annenberg Center For The Performing Arts Inaugural Gala in Beverly Hills.

As Us Weekly exclusively revealed in September, Stefani and husband Gavin Rossdaleare expecting their third child together. A source told Us at the time, "It's very new and they just found out. They're excited!" (The spouses, who wed in 2002, are already parents to sons Kingston, 7, and Zuma, 5.)

Indeed, the couple looked very excited at the gala on Thursday. Stefani showed off her burgeoning bump in a stunning, beaded Ferragamo gown while holding hands with Rossdale, 47, who looked handsome in a black tuxedo.

An eyewitness told Us the pair couldn't stop smiling the entire time on the red carpet. Stefani also twirled in her fringe dress, but walked carefully in her high heels. During cocktail hour, an insider told Us the couple posed together in a photo booth. "She had a huge glowing smile on her face and was totally having fun," a source said of the third-time mom-to-be. "Gavin held her hand very attentively and admirably."